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Neil Flewitt, QC, prosecuting, said that expert Clifford Todd had examined the wreckage of the bomb sites.

He said: "It is, in the opinion of Mr Todd, noteworthy that at each scene, some personal materials and documents, such as ID cards, were found relating to the bombers.

"Although they were damaged to some extent, they did not show the damage that would be expected if they were on the body of the bomber or in the rucksack, suggesting that in each case they had been deliberately separated by some distance from the actual explosion."

The bombers began to make their bombs three months before the attacks at two houses in Leeds, the court heard.

Traces of DNA from the three defendants accused of helping the bombers - Waheed Ali, Sadeer Saleem and Mohammed Shakil - were found inside both bomb factories, the prosecution claim.

The three men are accused of going on a two-day trip to London on Dec 16 and 17 where they pinpointed potential targets and visited the Natural History Museum, the London Eye and the London Aquarium.

All three men deny one charge of conspiring with the four bombers and others unknown to cause explosions between Nov 17, 2004 and July 8, 2005.